Reverse suction press assembly



Sept. 29, 1953 L. HORNBOSTEL 2,653,523

REVERSE SUCTION PRESS ASSEMBLY F'iled Sept. 27, 1950 i 1 I I l l I iZZYVEHi an v Q loyJHorzzbosgl by I Patented Sept. 29, 1953 REVERSESUCTION PRESS ASSEMBLY Lloyd Hornbostel, Beloit, Wis., assignor toBeloit Iron Works, Beloit, Wis., a corporation of Wisconsin ApplicationSeptember 27, 1950, Serial No. 186,999

2 Claims.

This invention relates to a paper machine press section which conveys a,freshly formed moist web of paper from its forming surface through aplurality of suction presses without any open draws and transfers theweb a plurality of times from one conveying felt to another whileproviding a self-dumping doctor arrangement for at least one of thesuction presses.

Specifically, the invention deals with a suction press assembly for aFourdrinier type paper making machine wherein a first suction presstransfers the web from a transfer felt to a bottom felt While dewateringthe web, wherein this bot tom felt then conveys the web to a suctiontransfer roll in advance of a vertical passage pressure nip of a secondsuction press to again transfer the web to another felt for reversesuction treatment of the web.

According to this invention, a pick-u felt or transfer felt is directedagainst a web on a Fourdrinier forming wire at a point along the upperrun of the forming wire located between the suction couch roll and theturning roll. A suction transfer roll is provided within the loop ofthis felt to remove the web from the wire. The felt then conveys the webover a bottom felt and into the nip of a first suction press. This firstsuction press has vertically aligned rolls defining a horizontal nipwith a bottom suction area that transfers the web to the bottom felt.The pick-up or transfer felt is then separated from the web and cleanedby a suction roll en route back to the suction transfer roll. The bottomfelt conveys the web on its top face to a reverse press felt which isurged against the web by a combination suction transfer and suctionpress roll. This roll has a suction transfer nip acting through thereverse press felt to transfer the web from the bottom felt to thereverse press felt.

ihe web on the reverse press felt then follows around the combinationtransfer and suction press roll to an upward passage vertical nip wherewater is extracted through the opposite or top face of the web. Thissecond suction press has a plain roll receiving the web therearoundafter passage through the vertical nip. A selfdumping doctor on thisplain roll maintains the press in a clean condition. The web is thenconveyed to another felt for conveyance through a third suction. press.

A feature of this invention includes a suction roll for cleaning thetransfer felt.

Another feature of the invention resides in the provision ofhorizontally arranged suction press rolls defining an upward passageself-draining vertical nip and a self-dumping doctor for cleaning thepress.

' It is, then, an object of this invention to provide a paper machinepress section equipped with a plurality of suction presses and felt runsso arranged that the paper web does not have an open draw, and issubjected to reverse suction treatments through clean felts.

Another object of the invention is to provide a reverse suction pressassembly for Fourdrinier type paper making machines wherein the reversepress is so arranged that its plain roll can have a self-dumping doctorcoacting therewith for maintaining a clean suction nip.

Another object of the invention is to provide a suction press sectionfor Fourdrinier paper making machines wherein a suction transfer rollcooperates with a pick-up felt that conveys the web into the firstsuction pressure nip and is continually cleaned by a separate suctionroll in advance of the suction transfer roll.

A still further object of the invention is to provide an improved feltrun arrangement for a paper machine press section wherein a web passingthrough the section never has any exposed open draws and wherein thesuction press rolls are arranged to successively act through oppositefaces of the web.

Other and further objects and features of this invention will beapparent to those skilled in the art from the following detaileddescription of the annexed sheet of drawings which, by way of exampleonly, illustrates a preferred embodiment of the invention.

On the drawings: I

The single figure of the drawings is a die.- grammatic representation ofthe preferred form of reverse suction press section of the presentinvention.

As shown on the drawings:

A Fourdrinier paper making machine forming wire In trained over asuction couch roll H and around a wire turning roll l2 conveys a newlyformed wet web of paper W over the suction area l3 of the couch roll toa pick-up felt or transfer felt M which is urged into contact with theweb by a suction transfer roll l5 at a point on the upper run of thewire between the suction couch roll II and the turning roll l2, Thetransfer roll l5 has a suction area It acting through the felt l4 toeffect a suction transfer of the web onto the felt. The suction transferroll I5 is not backed by a roll within the loop of the wire Ill and onlyurges the felt l4 gently against the web W.

The felt l4 conveys the web W on the under face thereof along ahorizontal run to the horizontal nip of a first suction press l1. Thispress I! has a plain top roll l8, a bottom suction roll I9, and asuction area 20 in the roll |9 at the nip between the rolls. A bottomfelt 2| is guided by a guide roll 22 along an upper horizontal run intothe nip of the first press where it covers the web on the felt l4.

After passage through the nip of the press II, the felt I4 is trainedupwardly around a guide roll 23 away from the web on the rupperrun a!the felt 2|. The suction area serves to transfer the web from the bottomrun .of the felt 134 to the top run of the felt 2|. passage around theroll 23, then passes around a stretcher roll 24 to several inside loopguide rolls 25 and thence around an external roll 2B to travelvertically upward through a vertical passagenip between a suction roll21 and a plain roll 28 cooperating with the suction roll. The roll 2"!has a suction area 29 acting through the web-contacting face of the feltM. The suction roll 21 cleans and dries the felt 14 before it recontactsthe web W. A save-all collector 30 is provided around the roll "21 *toreceive water thrown from the roll. The felt, after passage over thesuction area 29 then travels around the top of the roll 28 to an insideloop guide roll 3| immediately in advance of the suction transfer roll15.

The felt 2| with the web thereon passes from the nip of the suctionpress under a reverse press 32 composed of a double suction areaequippedsuction roll 33 and a cooperating plain roll 84. aligned to provide anupward passage vertical nip thcrebetween.

The suction roll 33 has a suction transfer area '35 in the bottomportion thereof and a second suction area 36 in the side thereof at thenip between the rolls 33 and 34. The upper run of the felt 2| extendsbeyond the suction transfer area and is trained around an inside loopguide roll 31 which directs the web on the upper run of the felt againsta reverse press felt 35. The reverse press felt '38 is trained under thesuction roll '33 and the transfer area '35 removes the web from the felt2| to the web 38. The felt 2| their travels alone around the roll '31and down to a stretcher roll 39 and thence around outside 'loop guiderolls :40 and A1 to an inside loop guide roll 42 and thence backto theguide roll 22.

The reverse :press felt 13:8 conveys the web upwardly through the nip ofthe :press 32 and the suction area 36 acts through the felt to removewater through the top or 'non-wireside face of the wveb. The webthen'travels around the plain roll 34 :to another :felt 43 having ahorizontal top run between guide rolls 44 and 45. This "horizontal upperrun extends through the horizontal inip of another suction press 46. Thepress #6 is composed of atop plainrolll-l and a'bottomsuc- :tion roll 48having a suction :area '49 at the horizontal nip between the rolls. Thefelt 43 travels downwardly from the roll to a stretcher roll 50 andthence around outside loop guide rolls 5| and-52 to an inside loop'guideroll 53 andthence backto the roll-l4.

The plain press roll 34 0f the reverse press v3,2 has a self-dumpingdoctor or scraper blade 5'4 coasting therewith on thedescending sidethereof so that any foreign matter or broken bits of paper willbe'removed from the roll surface before it re-"entersthe web. Since thedoctor is vertically disposed, any foreign material received The feltI4, after The rolls 83 and Bl are horizontally I 4 thereon from the rollwill be discharged by gravity.

From the above descriptions, it will be understood that the paper web Won the forming wire I0 is transferred to the transfer felt H at a pointon the wire between the suction roll II and the turning roll I2 by meansof the suction transfer roll 1|5. The web is then conveyed on the underface of the horizontal run of the transfer felt I! to the horizontal nipof the first suction press H where it is covered by a bottom felt 2|.The .web zbetween thefelts H and 2| is subjected to suction and pressurein the suction press l1 and water is removed from the web through thewire side face thereof and through the bottom felt 2 The bottom suctionroll IQ of the first suction press I?! "transfers the web to the bottomfelt 2| and the transfer felt then travels alone through a'cleaningsuction roll assembly which opens up and dewaters the felt before itrecontacts the web on-the forming wire. The bottomfelt thenconveys theweb on the top face thereof :under a suntion transfer area 35 .of thesuction roll of 18.1"?" -verse:press 32. A reverse press felt 38 coversthe nonwire side .or top face of the web on the felt 2i|-and thesuctionarea 35 is :effective to transfer the web .to this reverse pressfelt. The reverse press felt :then conveys the "web around :the suctionroll '33 of the reverse :press ;32 and through the :vertical :nip of thepress where :the web is subjected to .a second presstreatmentzand tosuction :acting through the reverse press felt. The suction area 3.5"pulls water .out of the nonwire side rortop face of the web. The web,after passagethrough the vertical nip-of the reverse press, then travelsaround zthe plain :roll of this press onto the :upper horizontal :run ofanother felt it which conveys the web through a third suction "press#6..

It will be amderstoodthat the web Win its passage through the entirepress section is notsubiect to any elongated unsupported Open draws, istransferred a plurality of times from one can- :ueying felt to anothenissubjected tor-suctionaeting successively through opposite faces thereof,and is :kept-free of foreign matter by a self-dimping'doutor coastingwith the reverse press.

.It will ".be understood that modifications and mariations may :beefiected without departing from the scope of the novel concepts ofthepmrent invention.

I claim :as snyzinvention 1. .A reverse suction press assembly for apaper making machine which comprises a first suction press defining ahorizontal suction nip, a second reverse .suction press defining anupward passage vertical nip, a third suction press defining a horizontalsuction :nip, a looped transfer felt trained through the horizontal nipof the first suction press, :a suction transfer roll in the loop of saidtrans-fer felt, a bottom felt trained through the horizontalnip .of saidfirst suction press coasting with thetransfer felt to cover the web asit passes throng-h said nip, said first suction press having the suctionarea thereof acting through said bottom felt to effect transfer of theweb from the transfer felt to the bottom felt, said bottom felt havingan upper :run conveying the web under .said reverse press, said reversepress having a suction roll with a reverse press felt trainedtherearound and through the upward passage vertical nip of the press,said suction-roll of the reverse press felt having a suction transferarea acting through said reverse press felt on the web carried by thebottom felt to transfer the web to the reverse press felt, said reversepress having a plain roll coacting with the suction roll and receivingthereover the Web from the reverse press felt after passage of the webthrough the vertical nip, a self-dumping doctor coacting with said plainroll of the reverse press, and a second bottom felt having an upper runtrained through said third press for receiving the web from the plainroll of the reverse press to convey the web through the horizontal nipof the third press.

2. A paper machine press section which comprises a plurality of suctionpresses having horizontal suction pressure nips, a reverse press betweensaid suction presses having a vertical suction pressure nip, bottomfelts for conveying a web through the horizontal nips of said presses, areverse press felt for conveying the web through the vertical nip of thereverse press, a transfer felt for conveying the web to the firsthorizontal nip, a suction transfer roll acting through said transferfelt, and a separate suction cleaning roll acting through the outer faceof said transfer felt.

LLOYD HORNBOSTEL.

References Cited in the file of this patent UNITED STATES PATENTS NumberNumber Name Date Tompkins June 23, 1925 Millspaugh Dec. 7, 1915 CathcartJan. 5, 1926 Kellett Apr. 25, 1933 Millspaugh Jan. 9, 1940 MillspaughJune 11, 1940 Berry July 30, 1940 Berry July 30, 1940 Berry Oct. 9, 1945Hornbostel et a1. Feb. 4, 1947 FOREIGN PATENTS Country Date Germany Feb.25, 1910 Germany July 7, 1926

